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    <a href="../index.html">cppreference.com</a> &gt; <a href=
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    C/C++ Pre-processor Commands
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  <p><a href="all.html">Display all entries</a> for C/C++ Pre-processor
  Commands on one page, or view entries individually:</p>

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    <tr class="category-table-tr-2">
      <td class="category-table-td"><a href="sharp.html">#, ##</a></td>

      <td class="category-table-td">manipulate strings</td>
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      <td class="category-table-td"><a href=
      "define.html">#define</a></td>

      <td class="category-table-td">define variables</td>
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    <tr class="category-table-tr-2">
      <td class="category-table-td"><a href=
      "error.html">#error</a></td>

      <td class="category-table-td">display an error message</td>
    </tr>

    <tr class="category-table-tr-1">
      <td class="category-table-td"><a href="preprocessor_if.html">#if,
      #ifdef, #ifndef, #else, #elif, #endif</a></td>

      <td class="category-table-td">conditional operators</td>
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      <td class="category-table-td"><a href=
      "include.html">#include</a></td>

      <td class="category-table-td">insert the contents of another
      file</td>
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    <tr class="category-table-tr-1">
      <td class="category-table-td"><a href="line.html">#line</a></td>

      <td class="category-table-td">set line and file information</td>
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    <tr class="category-table-tr-2">
      <td class="category-table-td"><a href=
      "pragma.html">#pragma</a></td>

      <td class="category-table-td">implementation specific
      command</td>
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      <td class="category-table-td"><a href=
      "undef.html">#undef</a></td>

      <td class="category-table-td">used to undefine variables</td>
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      <td class="category-table-td"><a href=
      "preprocessor_vars.html">Predefined preprocessor
      variables</a></td>

      <td class="category-table-td">miscellaneous preprocessor
      variables</td>
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